CVS commit: src/sys/dev/usb

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Mon Mar 28 12:44:06 UTC 2022

Modified Files:
        src/sys/dev/usb: uhidev.c

Log Message:
uhidev(9): Fix race between uhidev_close and uhidev_intr.

uhidev_intr currently relies on the kernel lock to serialize access
to struct uhidev::sc_state, but if the driver's sc_intr function
sleeps (which it may do, even though this runs is softint context --
it may sleep on an adaptive lock), uhidev_close might return while
the driver's sc_intr function is still in flight.

This avoids that race, and makes progress toward MP-safe uhidev.


To generate a diff of this commit:
cvs rdiff -u -r1.88 -r1.89 src/sys/dev/usb/uhidev.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.